When using an in-line ammeter, how should the meter be connected?

When using an in-line ammeter, it is essential to connect the meter in series with the circuit. This configuration allows the ammeter to measure the current flowing through the circuit directly. The principle behind this is that an ammeter is designed to have very low internal resistance, ensuring that it does not significantly alter the flow of current in the circuit.

In a series connection, the entire current that flows through the circuit must also flow through the ammeter, providing an accurate reading of the current. If the ammeter were connected in parallel, it would create a short circuit around the measuring device, leading to potentially damaging conditions such as excessive current flow or even damage to the ammeter itself.

Choosing the correct configuration for measuring current is crucial for safety and accuracy in electrical work. The use of an ammeter in series is a fundamental practice that all electricians should understand and apply in their work.